High and low water alarm.



PATENTED NOV. 5, 1907.

S. E. JARVIS. HIGH AND LOW WATER ALARM.

APPLIUATION FILED APILS, 1903.

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71424 022; Pars/as C0,, wnsnmswu, 04 c SAMUEL E. JARVIS, OF LANSING, MICHIGAN.

HIGH AND LOW WATER ALARM.

Specification of Letters Patent.

Patented Nov. 5, 1907.

Application filed April 3, 1903. Serial No. 150,928.

To all whom it may concern:

Be it known that I, SAMUEL E. .Lmvrs, a citizen of the United States, residing at Lansing, in the county of Ingham and State of Michigan, have invented certain new and useful Improvements in High and Low Water Alarms, of which the following is a specification.

My invention relates to that class of high and low water alarms in which the effect is produced by the ac tion of weights upon levers attached to a valve, and the objects of my invention are: First. To do away with all floats and other attachments which may be destroyed by the effect of steam, hot water or pressure. Second. To make a device which shall require but one alarm for both high and low water and but one set of working parts, and shall therefore be more simple and durable.

-I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure l,shows a vertical section of my device in one of its preferred forms, said section being made along the line parallel to the direction of the levers. Fig. 2 shows a modified method of suspending the lower weight when the weights are directly over each other.

Similar letters refer to similar parts throughout the different views.

My device is preferably mounted in a water column, A, of the usual construction, and which may be either round or elliptical, or any desired shape, and which is connected to the boiler in the usual manner. This water, column, however, forms no part of my invention and might be entirely dispensed with and the device mounted in the boiler itself. The essential feature of my device consists of the two weights C and D. These two weights are attached severally to the inner ends of two bell crank levers, .l and H, the opposite ends of which are connected by the link N. in such a manner that the one tends to counterpoise or counterbalance the other. The relation between the two weights is, however, such that the lower weight C preponderates over or over-balances the upper weight D when both are under the same conditions, but the amount of the preponderance is less than the weight of the water displaced by the weight (1, a valve K is attached to the bell crank lever J, so that when the weight 0 rises, it will raise the valve .K, and thus close the passage to the whistle L. The lugs to which the levers J. and H, are pivoted are preferably attached to the top B, of the water column, instead of in the manner shown in the drawings, thus enabling the entire working parts of the device to be removed by merely removing the cover of the water column. The preponderance of the weight 0 over the weight D may be seciu'ed either by making the weight 0 heavier than the weight D or by making the arm of the lever to which the weight G is attached slightly longer than that to which the weight D is attached, but in either case the preponderance of the weight 0 over the weight D must be less than the weight of the water displaced by the weight C. It is also of advantage to have the two weights approximately equal in bulk though this is not essential. -It is also evident that the weights C and D may be of any material or construction desired and may be suspended either by a single support or by one of the forms shown in Fig. 2. The effect of this construction is as follows:

Suppose the weights to stand in the position shown in Fig. 1, the water column being empty. The weight 0 will fall by reason of its preponderance, occupying the position shown by the dotted lines, drawing down with it the valve K, opening a passage for the steam to escape to the alarm L. Now, suppose the column to be filled with water until the weight C is submerged.

The weight of the weight 0 being then diminished by the I water displaced by it, the weight D will preponderate and will therefore fall, occupying the position shown by the drawing, raising and thus closing the valve K. Now, suppose the column to be filled until the weight D is also submerged. The weight of both weights will then be diminished by the weight of the water dis placed by them and the weight 0 will again preponderate and will fall, opening the alarm valve. appears that the alarm will be opened either by the water in the boiler sinking below the weight 0 or rising above the weight D.

If it is desired to hang both weights in the center of a round column, the construction shown in Fig. 2 may be employed. In this the weight C is attached to one arm of a lever J, preferably of the bell crank form, the weight D being attached to one arm of a similar lever H. The other arms of the two levers are connected by the link N, thus producing the same effect in the same manner as in Fig. 1.

Claims.

A device of the character described comprising :1 casing, an outlet leading from the casing and provided with a valve seat projecting within the casing, 21 pair of hell crank levers pivoted within the casing, each having a vertically disposed arm and a horizontally disposed arm, the

horizontally disposed arms of said levers extending in-.

\vardly towards each other, a link connecting the vertically disposed arms of the bell crank levers and bodily movable therewith, weights suspended from the horizontally disposed arms of said levers, and a valve secured to the horizontally disposed arm of one of said levers and ar ranged to cooperate with the valve seat .of the alarm.

In testimony whereof I afiix my signature in presence of two witnesses.

SAMUEL E. JARVIS. Witnesses GENEVIEVE M. FULLER,

CLARK C. W000.

It thus 

